The correct answer is C. Parliament.
Parliament is the supreme legislative body of India. It is composed of the President and the two Houses of Parliament, the Lok Sabha (House of the People) and the Rajya Sabha (Council of States).
The Constitution of India can be amended by a process that requires a special majority in both Houses of Parliament and the assent of the President. The amendment process is designed to be difficult, so that the Constitution is not amended lightly.
The Ministry of Defence is a ministry of the Government of India that is responsible for the defence of India. The Prime Minister’s Office is the principal office of the Prime Minister of India. The Securities and Exchange Board of India is the regulator of the securities market in India.
The Ministry of Defence, the Prime Minister’s Office, and the Securities and Exchange Board of India do not have the power to amend the Constitution.